I am looking for something for men
Hmm, I'd still recommend spiral steel over straight and encourage you to consider a having a back up plan. Men's corsets tend to be shorter in the torso, so you'd be better off on rides, but just as hot. As far as costuming, I've always considered Dr. Facilier's top very close to a corset. Also, Ratcliff's vest & John Smith's top would have functioned that same way. (I worked with some costuming at Colonial Williamsburg those vests were stiffer than a lot of corsets I know.)